Program: NOVA | Type: Clip | Aired: 2019-06-10

The Evidence for Planet Nine’s Existence

Two astronomers argue that the farthest objects in the Kuiper Belt are being pushed and pulled by the gravity of Planet Nine, a giant planet orbiting over 10 times farther from the Sun than Neptune. If they find it, it’ll be the first real expansion of the Sun’s planetary album in 170 years.

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The Evidence for Planet Nine’s Existence